Solar Heating harnesses the power of the sun's energy. Your existing filtration system will direct the water through a series of panels attached to your roof. These panels will be attached in an ideal position for the most exposure to direct sunlight.
There is no cost factor other than your pool pump operation after the initial installation.
A heat pump may suit you if you prefer swimming regardless of the weather or time of year. (If sized correctly). Heat pumps are highy efficient and utilize proven refrigerant technology to capture latent heat from the ambient air and transfer it to the pool water.. Unlike Solar Heating there is an ongoing cost to operate a Heat Pump.